Mitsubishi Lancer Evolution IX. Manual - part 435

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-215

STEP 14. Connector check: C-117 and C-119 
engine-ECU connector

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Repair or replace the connector.

AK501997

80

87

81

94

85

82

84

93

86

98

99

74

92

73

83

88

91

95

97 96

100

89

78

71

90

76

77

75

72
79

65

43
50

42
49

41
48
60

61

64

46

47

58

59

67

68

45

56
66

52 51

44

53

62

54

63

57

55

AB

Connector: C-117, C-119

C-119 (GR)

C-117 (GR)

C-119 (GR)

C-117 (GR)

C-117 Harness side connector

C-119 Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-216

Code No. P1012: Intake Camshaft Position Sensor System

OPERATION

• Power is supplied to the intake camshaft position 

sensor (terminal No. 3) from the engine control 
relay (terminal No. 4) and is earthed to the 
engine-ECU (terminal No. 34) from the intake 

camshaft position sensor (terminal No. 1).

• A power voltage of 5 V is applied to the intake 

camshaft position sensor output terminal (termi-
nal No. 2) from the engine-ECU (terminal No. 53).

2

1

3

1

2

3

4

AK501813

65

43
50

42
49

41
48
60 61

64

46 47
58 59
67 68

45

56
66

52

51

44

53

62

54

63

57

55

2

3 4

5 6

7 8

9

11 12 13 14 15 16 17 18 19 20

30

21 22 23

24 25

26 27 28 29

3132 33

34 35

1

10

5 V

Engine control relay

Intake camshaft position sensor

B-124

MU802337

53

1

R-Y

2

3

Engine-ECU

Intake camshaft position sensor circuit

34

B

L-R

B-12X

Battery

Wire colour code
B: Black  LG: Light green  G: Green  L: Blue  W: White  Y: Yellow  SB: Sky blue  BR: Brown  O: Orange  GR: Gray
R: Red  P: Pink  V: Violet  PU: Purple

C-119

(MU803782)

C-121

(MU803783)

B-Y

6 <A-13> (*1) or
13 <C-31> (*2)

B-Y

B-Y

NOTE

*1: L.H. drive vehicles
*2: R.H. drive vehicles

AC

2

1

4

3

To engine-ECU

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-217

FUNCTION

• The intake camshaft position sensor detects the 

top dead center on the compression stroke of the 
No. 1 cylinder and inputs a pulse signal to the 
engine-ECU.

TROUBLE JUDGMENT

Check Condition

• Engine: During the engine cranking and the driv-

ing.

Judgment Criterion

• The sensor output voltage remains unchanged 

(no pulse signal is inputted) for 4 seconds.

PROBABLE CAUSE

• Failed intake camshaft position sensor 

• Open/short circuit in intake camshaft position 

sensor circuit or loose connector contact

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-124 intake camshaft 
position sensor connector

Q: Is the check result normal? 

YES : 

Go to Step 2 .

NO : 

Repair or replace the connector.

STEP 2. Perform voltage measurement at B-124 
intake camshaft position sensor connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: "ON" 

• Voltage between terminal No. 3 and earth.

OK: System voltage

Q: Is the check result normal? 

YES : 

Go to Step 4 .

NO : 

Go to Step 3 .

AK502002

1

2

3

AB

Connector: B-124

B-124 (B)

Harness side 
connector

AK502002

1

2

3

AB

Connector: B-124

B-124 (B)

Harness side 
connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-218

STEP 3. Connector check: B-12X engine control 
relay connector

Q: Is the check result normal? 

YES : 

Check and repair harness between B-124 

(terminal No. 3) intake camshaft position 
sensor connector and B-12X (terminal No. 
4) engine control relay connector.

• Check power supply line for 

open/short circuit.

NO : 

Repair or replace the connector.

STEP 4. Perform voltage measurement at B-124 
intake camshaft position sensor connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: "ON" 

• Voltage between terminal No. 2 and earth.

OK: 4.9 

− 5.1 V

Q: Is the check result normal? 

YES : 

Go to Step 10 .

NO : 

Go to Step 5 .

AK305003

2

1

3

4

AB

Connector : B-12X

B-12X

Harness side 
connector

Relay box’s
triangle marks

AK502002

1

2

3

AB

Connector: B-124

B-124 (B)

Harness side 
connector

AK502002

1

2

3

AB

Connector: B-124

B-124 (B)

Harness side 
connector